Electric lamp



E. G. MASCARENHAS.

ELECTRIC LAMP.

APPLICATION FILED SEPT-5,1919.

I Patented June 27,1922.

IN l/E I'V TOR A TTORIVF YS' PATENT FFHQ ELECTRIC LAMP.

Application filed September 5, 1919.

HAS, a citizen of the Republic of Brazil, and a resident of Juiz de Fora, Estado de Minas,

Brazil, South America, have invented a new and Improved Electric Lamp, of which the following is a full, clear, and exact description.

This invention relates to electric lamps,

sometimes called glow lamps, and has for an object to provide an improved arrangement whereby by proper adjustment more than one filament may be used in the same globe.

Another object of the invention is to provide an incandescent electric lamp in which a number of filaments are provided and associated with a switch mechanism at the base of the lamp in order that any of the filaments may be connected up with a source of current when the lamp is in use.

In the accompanying drawing:

Figure 1 is a view of a lamp embodying the invention, shown'partially in elevation and partially in section.

Figure 2 is a section through Figure 1 on line 22.

Figure 3 is a bottom shown in Figure 1.

Figure 4' is a view but showing a slightly invention.

Figure 5 isa view similar to Figure 1, but showing a modified arrangement wherein one of the return wires is connected directly to the center contact.

Figure 6 is a bottom plan view showing the arrangement of contact structure illustrated in Figure 5.

plan view of the lamp similar to Figure 2, modified form of the Referring to the accompanying drawing by numerals, 1 indicates a globe which is provided with a base 2 of any usual construction for fitting in any desired socket. This base is provided with the usual contact 3 which is insulated from the metal shell engaging the socket in the usual manner so that the base 3 may be connected to either of the leading-in wires'4 and 5. This connection is through a switch 6 rotatably mounted on the contact 3 and provided with an arm 7 adapted to engage the ends 8 and 9 of the leading-in wires '4 and 5. Preferably the switch 9 fits rather snugly the contact 3 so that there will be always a good electrical connection. The base 2 supports aglass standard or tree 10 having what may be Specification of Letters Patent.

Serial No. 321,833.

termed a head 11 which is designed to carry supportlng members 12 which may be of wire, or other desired material. The standard 10 also may bemade of other material beslde glass, though glass is preferable by reason of its convenience in manufacture and arrangement in the bulb or globe 1. The supporting members 12 are connected in any suitable manner to the as shown in Figure 2, while the leading-in wires 4 and 5 are electrically connected to the ends of these filaments, and a common return mm 15 is connected to the opposite end of the filaments 13 and 14 engaging the wires 4 and 5. In the drawing the filaments 13 and 14 are shown as a single member, which may be the case, or they may be separate and individually connected to the com- I mon return 15.

In Figures 1, 2 and 3 the lamp is shown as having two filaments, but it is to be understood that any number of filaments could be used having equal lighting power and capable ,of receiving the same current, or arranged to receive the same current, but with difi'erent lighting powers, as for instance the construction shown in Figure 4.

In Figure 4. a slight modified form of the invention is shown in which the same arrangement ,is illustrated as shown in Figure 2, except that two additional filaments 13 and 14 are provided so that by a proper operation of the switch 6 any one of the four may be used. As above mentioned any number of filaments may be used and connected to what is termed a common return and to independent leading-in wires. Preferably all of these filaments are capable of receiving the same voltage and the same amperage, though if desired the filaments could be varied for any particular purpose desired, In using the lamp thearm 7 is placed on one of the leading-in wires and then the lamp screwed into a suitable socket. As soon as it has been properly screwed into the socket and turned on current will flow through contact 3 to the switch 6 and from thence through arm 7, end 8, leading-in wire 4 to filament 13 and from thence through the return wire 15 and base 2 to the source of current. Current will continue to flow in this manner until the switch 6 is changed or until the filament 13 has burned out. Whenever filament 13 burns out, or is broken through any cause the lamp is removed and the arm 7 filaments 13 and 14 the switch of the 'socket' Patented'June 27,1922.

and the lamp again placed in its socket.

When shifted to the end of leading-in wire .5 current will be supplied to the filament 14 which will give the desired illumination. If there are additional filaments as shown in Figure 4: the switch may be additionally shifted from time to time until all the filaments have been used or until the deposit on the interior surface of the globe 1 has made the lamp unserviceable. Where there is a chemical provided in the bulb for preventing a deposit on the globe 1 a large number of filaments may be used 'in' one bulb.

Referring to Figures 5 and 6, a further modified form of the invention is shown wherein the central lead-in wire 15 is connected with contact 3 while the remaining lead-in wires are provided with suitable contacts 16,17 and 18 connected to suitable filaments, as for instance the filaments 13,

' 13, 14 and 14', shown in Figure 4:. By this construction and arrangement the arm 7 is left out of engagement with any of the contacts 16 to 18 when the lamp is first screwed into the socket. This will cause current to.

pass through the central contact 3, lead-in wire 15 to one of the filaments, through said filament and out the wire 15 to the sleeve 2 and from thence back to the source. It is, of course, understood that the return 7 wire 15 is used in connection with the structure shown in Figure 5. When the first filament has burned out the lamp is removed and the arm 7 moved to one of the contacts 16, 17 or 18 and is then inserted into its socket. When the second filament has burned out the lamp is removed and the arm plane, contiguous to each other in a plane at right angles to said standard, said filaments being also arranged eccentrically to each other and a lurality of lead-in wires connected with said filaments, one of said lead-in wires being connected to all of the filaments and acting as a common return while the other lead-in wires are connected to individual filaments whereby any filament may be used independently.

2. In an incandescent electric lamp a globe, a base, a standard carried by the base and projectin into the globe, a plurality of open ring li aments arranged in the same plane and at right angles to the standard, said filaments being contiguous for substantially the full length and a plurality of lead-in wiresconnected with said filaments, one of said lead-in wires being connected to all of the filaments and acting as a common return while the other lead-in wires are connected to individual filaments, said common return wire acting to divide each of said filaments .into two arc-shaped sections.

runs GEUINARIES MASCARENHAS. 

